The Q&A Archives: Snow mold

Question: I believe we have a spread of snow mold (or perhaps it is red thread---not sure) in the lawn (patches of white/light colored grass throughout the lawn). What can we do we get a handle on this?

Answer: Red thread is more common in Puyallup than snow mold. The blades of grass actually look like red yarn. Snow mold can occur, and since you had snow this past winter, perhaps that's what you have in your lawn. In either case, it is a fungus. During cool, wet weather, reddish brown circular patches (1 to 2 inches in diameter) of turf appear. White or pinkish fungal growth may be at the advancing edge of the patch. Patches may enlarge and coalesce to form extensive affected areas. The center is generally tan and may contain uninjured grass. In areas with snow cover, the fungus may grow beneath the snow or, more commonly, as snow melts. You can use a fungicide such as Daconil Weather Stik or Hi-Yield Turf and Ornamental Fungicide. Apply according to label directions.

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